diff --git a/app/src/main/java/io/legado/app/ui/book/info/edit/BookInfoEditActivity.kt b/app/src/main/java/io/legado/app/ui/book/info/edit/BookInfoEditActivity.kt
index 76b8ac47f..8d9ddacd4 100644
--- a/app/src/main/java/io/legado/app/ui/book/info/edit/BookInfoEditActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/book/info/edit/BookInfoEditActivity.kt
@@ -132,7 +132,8 @@ class BookInfoEditActivity :
         book.addType(bookType)
         val customCoverUrl = tieCoverUrl.text?.toString()
         book.customCoverUrl = if (customCoverUrl == book.coverUrl) null else customCoverUrl
-        book.customIntro = tieBookIntro.text?.toString()
+        val customIntro = tieBookIntro.text?.toString()
+        book.customIntro = if (customIntro == book.intro) null else customIntro
         BookHelp.updateCacheFolder(oldBook, book)
         viewModel.saveBook(book) {
             setResult(Activity.RESULT_OK)
diff --git a/app/src/main/res/layout/dialog_add_to_bookshelf.xml b/app/src/main/res/layout/dialog_add_to_bookshelf.xml
index d80c2e793..f56205171 100644
--- a/app/src/main/res/layout/dialog_add_to_bookshelf.xml
+++ b/app/src/main/res/layout/dialog_add_to_bookshelf.xml
@@ -95,7 +95,7 @@
         android:layout_height="wrap_content"
         android:padding="16dp"
         android:text="@string/ok"
-        android:visibility="invisible"
+        android:visibility="gone"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toBottomOf="@+id/book_info" />